Method of joining sheaths for cores



Jan. 17, 1928.

W. s. YALE METHOD oF JOINING sHEATHs Fon coREs Filed April 9, 1925 Patented Jan. 17,. 1928.

UNITED STATES PATENT OFFICE.

WALTER SAWER YALE, F MAYWOOD, ILLINOIS, ASSIGNOR T0 WESTERN ELECTRIC COMPANY, INCORPORATED, 0F NEW YORK, N. Y., A CORPORATION 0F NEW'YORK.

METHOD OF JOINING SHEATHS FOR CORES.1

Application filed April 9, 1925.

This invention relates to methods of joining sheaths for cores, and more particularly to methods of insulating the spliced ends oi textile covered insulated electrical conductois and has for its primary object the provision of an improved method whereby sheaths of cores may be joined in a minimum amount of time and one that provides a maximum of mechanical strength and insulating qualities.

In accordance with the general features oi' this invention as applied to the splicing or electrical conductors having a braided textile covered insulation, the method consists 115 in drawing the braided covering and the insulation back from the ends oi the conductors, thereafter brazing or welding the conductors together, returning the end portions of the covering and insulation to substantially their original positions and in abutting relation. Fibrous material in strand or sheet form impregnated with substances Which may be cured, vulcanized or otherwise transformed into a substantially stable state by a chemical reaction when subjected to heat and pressure, such as synthetic resin or a rubber compound is wrapped around the abutting portions of the braided covering and the wrapped portion is subjected to heat and pressure to cure the resin or to vulcanize the rubber.

It is believed that the invention will be clearly understood from the following description and the accompanying drawing,

85 the figures of which illustrate the several steps by means oi which the invention may be practiced.

Fig. 1 is an elevational view showing the ends of a pair of electrical conductors pren pared and in position for the brazing or' welding of the ends thereof together;

Fig. 2 is an elevational View thereof after the brazing operation and with the end portions of braided covering and insulation in abutting relation;

Fig. 3 is an elevational View thereof with a wrapping of impregnated fibrous strand material around the splice;

Fig. 4 is a sectional view illustrating diagrammatically'one means of applying heat and pressure to cure the synthetic resin or to vulcanize the rubber and mold the cover- Fig. 5 is an elevational view of an electri- Serial N0. 21,881.

cald conductor upon completion of the splice, an

Fig. 6 is a vertical section through the spliced conductors showing an alternative means for applying the synthetic resin or rubber compound. In practicing the invention as illustrated in'tlie drawing (Fig. 1) the rubber or other suitable insulation and the braided or other textile sheath or covering l2 thereover is slipped back for a distance indicated at 13 along a pair of conductors or other cores, 10 and 11 to be spliced. The ends of the conductors 10 and 11 are then brought into abutting relation and brazed or Welded in any manner well known in the art and thereafter the insulation and braided covering 12 at each side of the joint are restored to substantially their original positions with their` ends in an abutting relation as indicated at 14 (Fig. 2). The braided covering 12 upon each conductor may be spliced at the junction 14 by wrapping therearound for a suitable distance at either side of the junction 14, a fibrous material, for instance cotton thread 15 impregnated either with a synthetic' resin or a vulcanizable rubber compound,lor a sheet of fibrous material such as cloth indicated at 16 (Fig. 6) and similarly treated. In using the sheet 16, the ends thereof` are preferably overlapped as indicated in dotted outline at 17 and the sheet extends a distance at each sideof the junction 14, as indicated for the thread 15 in Fig. 3. `The braided covering 12 itself may be similarly impregnated or otherwise treat4 ed with resin in aliquid form or treated ,with vulcanizable rubber compound. The spliced conductor as illustrated in Figs. 3 or 6 is then placed in a press of any suitable type (not shown) having molds or platens as indicated at 18 and19. The platens may be heated by passing steam through the passages 2() to any desired temperature and subjected to a suiiicient and predetermined pressure to completely transform the impregnating substance by a chemical reaction into a substantially stable state. Thus the synthetic resin is transformed into an insoluble and infusible. product or the rubber compound is vulcanized, the cured resin or vulcanized rubber forming an insulator for the brazed conductors as well as a bond for the abutting ends of theA textile braided covering i material around 12. The forming portions of the platens 18 and 19 are such that upon completion of the s licing and insulating method hereinabove escribed the diameter of the spliced and insulated portion will be substantially. the same as that of the balance of the insulated electrical conductor. When the fibrous material is impregnated with a vulcanizable substance,A a rubber compound including sulphur in a finely divided or colloidal form or some other suitable compound capable of being quickly vulcanized is preferable.

In splicing insulated electrical conductors it is desirable that a splice be made and insulated in as short a time as possible and still possess high insulating qualities and mechanical strength without materially detracting from the flexibility of the conductor along the spliced portion. A splice formed by the hereinbefore described method possesses these characteristics.

,What is claimed is:

1. rlhe method of joining textile protective sheaths for cores, which consists in placing the end portions of sheaths adjacent, applying a synthetic resinous substance to the end portions, and subjecting the applied substance to heat and pressure to transform it into an infusible and insoluble product thereby bonding the end portions.

2. The method of joining textile protective sheaths for cores, which consists in placing the end portions of sheaths adjacent, applying a covering of material impregnated with a synthetic resinous substance to the end portions, and subjecting the material to heat and pressure to transform the substance into an infusible and insoluble roduct thereby bonding the end portions.

3. The method of joining textile protective sheaths for cores, which consists in placing the end portions of sheaths adjacent, serving a fibrousstrand impregnated with a synthetic resinous substance around the end portions, and subjecting the substance to heat and pressure to transform it into an infusible and insoluble product thereby bonding the end portions.

4.-. The method of joining the covering of insulated electrical conductors, which consists in placing the end portions of the covering in abutting relationship,treating the covering adjacent the abutting ends with a material which can be transformed into an infusible and insoluble product by heat and pressure, and then subjecting said material to heat and pressure to transform it into/ an infusibleV and insoluble product bonding the ends of the covering.

5. The method of joining the covering of insulated electrical conductors, which consistsin placing end portions of the covering in abutting relationship, forming a film of the covering adjacent the abutting ends which can be transformed into an infusible and insoluble product by heat and pressure, and subjecting said material to heat and pressure to transform it into an infusible and insoluble product bonding the ends of the covering.

6. The method of joining the covering of insulated electrical conductors, which consists in placing the end portions of the covering in abutting relationship,applying a synthetic resin to the covering adjacent the abutting ends, and curing said synthetic resin to form an infusible and insoluble bond between the ends of the covering.

7. The method of joining the covering of insulated electrical conductors, which consists in placing the end portions of the covering in abutting relationship, serving a fibrous material impregnated with a synthetic resin around the covering adjacent the abutting ends, ends to heat and pressure to transform the resin into a final condensation product to form an infusible and insoluble bond between the ends of the covering.

8. The method of joining the covering of insulated electrical conductors, which consists in placingl the end portions of the covering in abutting "relationship, serving a strand of fibrous material impregnated with a synthetic resin spirally around the covering adjacent the abutting ends, and subjecting the served ends to heat and pressure to transform the resin into a final condensation product to form an infusible and insoluble bond between the ends of the cover- 9. The method of joining the covering of insulated lelectrical conductors, which consists in placing the end portions of the covering in abutting relationship, wrapping a sheet of fibrous material impregnated with a synthetic resin around the covering adjacent the abutting ends, and subjectingthe wrapped ends to heat and pressure to transform the resin into a final condensation product to form an infusible and insoluble bond between the ends of the covering.

10. The method of joining textile protective sheaths for cores, which consists in placing the end portions of sheaths adjacent, treating the sheaths adjacent the abutting ends with a material which can be ltransformed into an infusible and insoluble productby heat and pressure, and subjecting said material to heat and pressure to so transform it thereby bonding the ends of the sheaths andsimultaneously therewith forming the ends to a diameter substantially the same as lthe adjoining portions of the sheaths.

11. The method of joining covered insulated electrical conductors, which consists in drawing back the covering from the ends of the conductors to be joined, connecting the ends of the conductors, returning the and subjecting the served acuesta their originati iositio'ns and with the en ation, serving a cotton thread impregnated f with a synthetic resin s irally around the 5 covering adjacent the abutting ends, and subjectingI the served yportions of the conductor to heat and pressure to transform the resin into a final condensation product rto form a bonc between the ens of the covering and simultaneously therewith orming the served portion to a diameter therefor substantially the same asthe adjoining portions of the covered conductor.

En witness whereof, E hereunto subscribe my name this 30 da of March, A. D., 1925.

WAL R SAWER YALE. 

